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WITH a AS (
   SELECT 
       OwnerUserId,
       CASE
          WHEN VoteTypeId = 2
             THEN 1
             ELSE 0
       END Upvote,
       CASE
          WHEN VoteTypeId = 3
             THEN 1
             ELSE 0
       END DownVote
   FROM Posts p INNER JOIN Votes v ON v.PostId = p.Id
)


Select OwnerUserId, sum(Upvote), sum(DownVote) from a
Group By OwnerUserId

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created nov 14 19 anonymous